IP FRR LFA

[afourmy]

In IP networks (OSPF and IS-IS), whenever a link (or node) fails, a Fast Reroute (FRR) protection can be activated for the router to precompute a next-hop to reroute the traffic (within < 50ms usually before the protocol reconvergence).
The next-hop must be chosen to avoid loops (Loop-Free Alternate).

• Implement the Fast Reroute protection algorithm based of RFC 5286 (https://tools.ietf.org/html/rfc5286)
• Update the configuration window with the FRR activation command in Cisco routers